Source : Webster's Revised Unabridged Dictionary (1913)

Somnambulistic \Som*nam`bu*lis"tic\, a.
   Of or pertaining to a somnambulist or somnambulism; affected
   by somnambulism; appropriate to the state of a somnambulist.

         Whether this was an intentional and waking departure,
         or a somnambulistic leave-taking and waking in her
         sleep, may remain a subject of contention. --Dickens.